Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B56/00—Azo dyes containing other chromophoric systems
  • C09B56/12—Anthraquinone-azo dyes
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07J—STEROIDS
  • C07J1/00—Normal steroids containing carbon, hydrogen, halogen or oxygen, not substituted in position 17 beta by a carbon atom, e.g. estrane, androstane
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07J—STEROIDS
  • C07J75/00—Processes for the preparation of steroids in general
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B1/00—Dyes with anthracene nucleus not condensed with any other ring
  • C09B1/16—Amino-anthraquinones
  • C09B1/20—Preparation from starting materials already containing the anthracene nucleus
  • C09B1/26—Dyes with amino groups substituted by hydrocarbon radicals
  • C09B1/32—Dyes with amino groups substituted by hydrocarbon radicals substituted by aryl groups
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B43/00—Preparation of azo dyes from other azo compounds
  • C09B43/08—Preparation of azo dyes from other azo compounds by reduction
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B43/00—Preparation of azo dyes from other azo compounds
  • C09B43/11—Preparation of azo dyes from other azo compounds by introducing hydrocarbon radicals or substituted hydrocarbon radicals on primary or secondary amino groups
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B43/00—Preparation of azo dyes from other azo compounds
  • C09B43/12—Preparation of azo dyes from other azo compounds by acylation of amino groups

Definitions

• R represents hydrogen, lower alkyl, hydroxy-lower alkyl, a1 kenyl of at most four carbon atoms, cyclohexyl or benzyl, and R represents hydrogen, lower alkyl, hydroxy-lower alkyl or R and R taken together with the nitrogen atom to which they are linked, represent pyrrolidino, piperidino or morpholino,
• Z represents phenyl or phenyl monosubstituted by chlorine, bromine, fluorine, nitro, lower alkyl, lower alkoxy, hydroxylower alkyl, lower alkoxy-carbonyl, lower alkyl-sulfonyl or lower alkyl-sulfonyloxy,
• ring A bears no further substituents or is further monosubstituted by methyl, methoxy or chlorine.
• the dyeings on polyethylene glycol terephthalate have great color strength and excellent fastness to sublimation and light.
• X represents the radical of an organic hydroxyl compound bound by way of an oxygen, or a primary, secondary or tertiary amino group
• Y represents a mobile substituent enabling nucleophilic substitution
• an amine of formula ll 2 represents an optionally substituted carbocyclic-aromatic or heterocyclic-aromatic radical, and the benzene ring A can have other substituents, preferably such that do not dissociate acid in water, to form a compound of formula Ill wherein R, and X have the meanings given for formula l and Z and A have those given for formula ll.
• the starting compounds are to be so chosen that the final dyestuff does not contain any salt-forming, water-solubilizing groups which dissociate acid in water such as sulfonic acid, carboxylic acid or phosphonic acid groups.
• R represents, e.g., isopropyl, ethyl and, especially, methyl; preferably however, R, is hydrogen.
• X represents, for instance, the group OR, wherein R is an optionally substituted aliphatic, cycloaliphatic, carbocyclic-aromatic or heterocyclic-aromatic radical.
• X is a primary, secondary or tertiary amino group, then it is, particularly, a group of the formula (III) optionally substituted aliphatic or cycloaliphatic radical, or R:,
• the dyestuffs according to the invention constitute two subclasses, one in which the 2-position of the anthraquinone nucleus is substituted by an esterified carboxyl group of the formula -co-oR,
• the dyestuffs of the first-mentioned subclass afford dyeings on hydrophobic fibers which are generally of greater lightfastness than those obtained with dyestuffs of the second subclass.
• the dyestuffs in which 2 represents an optionally substituted monoor dinuclear carbocyclic aromatic radical are more important because they are easier to produce than those in which Z is a heterocyclic radical.
• R R and R represent aliphatic radicals these are, e.g., straight or branched chain, optionally substituted alkyl or alkenyl groups, and in the latter case, particularly A2-alkenyl groups, having preferably up to five carbon atoms.
• these aliphatic radicals can contain, e.g., hydroxyl or preferably alkoxy groups, such as unsubstituted all-toxy, alkoxyalkoxy or alkoxyalkoxyalkoxy groups, or alltoxycarbonyl groups, wherein the alkoxy moiety has from one to three carbon atoms.
• substituents can also contain carbocyclic rings, especially of aromatic character, such as the phenyl radical, or heterocyclic rings, such as the thienyl-(Z), furyl-(Z) or tetrahydrofuryl-(2) radical.
• cycloalkyl groups with preferably fiveor six-membered rings and, especially, the cyclohexyl or methylcyclohexyl group.
• carbocyclic-aromatic radicals represented by R, and R mononuclear substituents of the benzene series are preferred, especially an unsubstituted phenyl group or a phenyl group substituted by at least one and preferably not more than three of the following substituents: nitro, chlorine, bromine, fluorine, alkyl, alkoxy, and/or one of the substituents hydroxy-alkyl, alkoxy-carbonyl, alkyl-sulfonyl or alkyl-sulfonyloxy, alkyl and alkoxy" portions having at most four carbon atoms.
• lf R and R represent heterocyclic-aromatic radicals, then these are preferably fiveto six-membered cyclic radicals, especially nitrogen-containing rings of aromatic character, e.g., pyridine radicals, more particularly the pyridyl-(3) radi cal.
• R, and R, together with the nitrogen atom to which they are linked represent a fiveor six-membered heterocyclic ring, then this is, e.g., the pyrrolidino, piperidino, piperazino, thiomorpholino or, especially, the morpholino ring.
• 2 is a carbocyclic-aromatic radical, then it is, e.g., a naphthyl or preferably a mononuclear residue of the benzene series.
• Z is a heterocyclic-aromatic radical
• Z is for example an azolyl radical which can be condensed, particularly with a benzene nucleus.
• 2-lower alkyl-indolyl- (3) radicals the diazolyl radicals such as pyrazolyl radicals, e.g., l-lower alkyl-pyrazolyl-(S) or l-phenyl-3-lower alkyl-S- hydroxypyrazolyl-(4) radicals, l-lower alkyl-indazolyl-(Zi) radicals or imidazolyl radicals, e.g., benzimidazolyl-(Z) radicals, or the ethiazolyl radicals such as thiazolyl-(Z) or benzothiazolyl-(Z) radicals.
• azinyl groups e.g., pyridyl groups such as the pyridyl-(3) group can be in the position of
• the carbocyclic-aromatic rings in X and 2 as well as the benzene ring A can contain other substituents which do not dissociate acid in water, rendering the dyestuffs water soluble, and do not elongate the resonance system, hence not detrimentallyfiecting the purity of the shade of the dyestuffs?
• suitable substituents are especially halogen, e.g., fluorine, chlorine or bromine, nitro, lower alkyl, hydroxy-lower alkyl, lower alkoxy, but also lower alkoxy-carbonyl, lower alkyl-sulfonyl or lower alkyl-sulfonyloxy groups.
• lower applied to alkyl and alkoxy means such groups having one to five carbon atoms.
• R represents hydrogen, lower alkyl, hydroxylower alkyl, alkenyl of at most four carbon atoms, cyclohexyl or benzyl
• R represents hydrogen, lower alkyl hydroxylower alkyl, or R, and R taken together with the nitrogen atom to which they are linked, represent pyrrolidino, piperidino or morpholino
• Z represents phenyl or a phenyl group monosubstituted by chlorine, bromine, fluorine, nitro
• the ring A is either without further substitution or bears one methyl group.
• Y as mobile substituent enabling nucleophilic substitution, represents e.g., halogen such as chlorine or bromine, a lower alkoxy group such as the methoxy or ethoxy group, the hydroxyl or the nitro group.
• halogen such as chlorine or bromine
• a lower alkoxy group such as the methoxy or ethoxy group, the hydroxyl or the nitro group.
• Y is bromine, or also chlorine.
• Some of the starting materials of formula I are known or can be produced by methods known per se, e.g., by converting an anthraquinone-2-carboxylic acid of the formula i) NIH-R1 COOH into its xylic acid "at 'biaaiiaeana reacting the" amino-Z-carbophenoxyt-chloroor -4-bromo-anthraquin-- one, l-amino-2-carbo-(pyridyloxy)-4-chloro or -4-bromoanthraquinone, l-amino-4-chloroor.
• aminoazo compounds of formula ll which can be used as starting material are also known, or they can be produced by the usual methods by coupling diazotized nitroanilines or acylamino anilines with coupling components and subsequent reduction of the nitro group or hydrolysis of the acylamino group to the amino group.
• the condensation of starting materials of fonnula l with the amines of formula II is performed, e.g. with an excess of amine in a melt at 70-250 C. it is preferably performed, however, in an inert organic solvent at reaction temperatures of l00-l60 C. in the presence of an acid binding agent and a catalyst.
• FoTnat ic hydrocarbons such as toluene or xylenes, halogenated aromatic hydrocarbons such as chlorobenzene or dichlorobenunes, or nitrated aromatic hydrocarbons such as nitrobenzene can be used, for example, as inert organic solvents.
• Alcohols are particularly suitable, especially alkanols having at least two carbon atoms, e.g. ethanol, nor isopropanol, butanols or amyl alcohols, 'or alkylene glycols and their monoalkyl ethers, e.g. ethylene glycol and its monomethyl or monoethyl ether.
• Alkali metal hydroxides particularly sodium or potassium hydroxides, alkali metal carbonates, especially sodium or potassium carbonate and alkali metal salts of lower fatty acids such as alkali metal acetates are mentioned as preferred acid binding agents.
• Copper or copper-(I) salts such as copper-(l) acetate or chloride are mentioned as preferred catalysts.
• a modification of the process according to the invention for the production of new, difficulty water-soluble anthraquinone dyestuffs of formula III consists in condensing an anthraquinone compound of formula 1V NH-Rr CO-Hal wherein X has the meaning given for fonnula I, to form a compound of formula III, the components being so chosen that the final dyestuff contains no salt-forming, water-solubilizing groups with dissociate acid in water.
• the anthraquinone compound of formula IV is obtained, e.g. by reacting the corresponding anthraquinone-Z-carboxylic acid with a halogenating agent such as thionyl chloride or phosphorus pentachloride by usual methods.
• a halogenating agent such as thionyl chloride or phosphorus pentachloride
• condensation of the anthraquinone compound of formula IV with the compound of formula V is performed in a known way, advantageously in an inert organic solvent, e.g. in an aromatic hydrocarbon, halogenated or nitrated hydrocarbon or in water and, optionally, in the presence ofacid binding agents.
• a second modification of the process according to the invention for the production of compounds of formula III wherein R,is hydrogen consists in reducing an anthraquinone compound of formula VI wherein X has the meaning given for formula 1, and Z and A have those given for formula ll, the components being so chosen that the end product obtained does not contain any salt-forming, water-solubilizing groups which dissociate acid in water.
• the reduction is advantageously performed with watersoluble sulfides or hydrogen sulfides in aqueous dispersion or in aqueous-organic solution or dispersion.
• the organic part of such mixtures preferably consists of water-miscible, inert, organic solvents such as tertiary nitrogen bases, e.g. pyridine or homologues thereof, or it consists of amides of low fatty acids such as N,N-dimethyl fonnamide, or of aliphatic alcohols e.g. alkylene glycol monoalkyl ethers, for example ethylene glycol monomethyl or monoethyl ether.
• a third modification of the process according to the invention for the production of new, difficulty water-soluble anthraquinone dyestuffs of formula III consists in condensing an anthraquinone compound of formula Vll wherein X and Y have the meanings given in Formula I, and Z and A have those given for formula II, with an amine of formula VH1 (VII) with an aminoazo compound of the formula wherein A, X, Y and Z have the meanings given above.
• a further modification of the process according to the invention for the production of anthraquinone dyestuffs of formula III wherein X represents a primary, secondary or tertiary amino group, consists in condensing an anthraquinone compound of formula IX with ammonia or a primary or secondary amine and, if Q is a nitro group, reducing said nitro group simultaneously to the amino group NH, the starting compounds being so chosen that the end product obtained does not contain any salt-forming, water-solubilizing groups with dissociate acid in water.
• the conversion of the esters of formula lX into the corresponding amides and optional reduction of the nitro group are carried out, preferably in an excess of ammonia or amines, and, optionally, in the presence of inert organic solvents such as given above for the other processes.
• the new anthraquinone dyestuffs of formula lll When producing the new anthraquinone dyestuffs of formula lll, they generally precipitate from the reaction mixture or they can be precipitated from the reaction mixture by the addition of water or of water-miscible, inert organic solvents, e.g. lower alkanols. In the pure state, they are shimmering deeply colored, crystalline substances.
• the dyestuffs according to the invention are brought into a finely distributed form by milling with dispersing agents.
• dispersing agents e.g. alkyl-aryl sulfonates, condensation products of formaldehyde and naphthalene sulfonic acids, lignin sulfonates, or nonionogenic dispersing agents such as fatty alcohol or higher alkylphenol polyglycol ethers are suitable.
• the dyestufis according to the invention are preferably milled with such dispersing agents with the addition of water.
• the resultant, aqueous dyestuff pastes which contain the dyestuffs in finely distributed form can either be used direct for dyeing or they can be formulated into nondusty powders by careful drying according to known methods.
• the dyestuffs according to the invention are suitable for the dyeing of organic material, particularly of hydrophobic organic fiber material, from an aqueous dispersion, e.g. for the dyeing of cellulose ester fibers such as cellulose di-, 2%-tri-acetate, preferably however, they are suitable for the dyeing of textile fibers made from polyesters of aromatic polycarboxylic acid with polyvalent alcohols such as polyglycol terephthalate, polyglycol isophthalate or polycyclohexane diol terephthalate fibers.
• the dyestuffs can also be used, however, for dyeing of synthetic polyamide fibers such as polyamide 6, 66 or 1 l In some cases, also valuable dyeings can be attained with the dyestuffs according to the invention polyacrylonitrile fibers.
• Polyglycol terephthalate fibers are dyed with aqueous dispersions of dyestufis according to the invention, for example, at temperatures of over C. under pressure. Dyeing can also be performed, however, at the boiling point of the dye liquor in the presence of carriers, e.g. alkali phenyl phenolates such as sodium-o-phenyl phenolate, polychlorobenzene compounds or similar auxiliaries. Very good dyeings are also obtained if these fibers are impregnated with concentrated aqueous dispersion of dyestuffs according to the invention, then squeezed out, dried and the dyestuffs are finally fixed at temperatures of 100 -250 C.
• carriers e.g. alkali phenyl phenolates such as sodium-o-phenyl phenolate, polychlorobenzene compounds or similar auxiliaries.
• the drawing power of the dyestuffs onto these fibers and the stability of the aqueous dispersions in the dye liquor can be improved by mixing two or more dyestufl's of similar composition of which at least one is embraced by formula III.
• the color strength may be improved as much as 50 to 100 percent.
• vegetable and animal fibers, particularly cotton are well reserved by the dyestuffs according to the invention.
• Another advantage of the dyestuffs according Coloration of the organic materials is effected in either case i by penetration of dyestuff molecules into the organic material, especially the fibers, and partial reagglomeration to larger dyestuff particles in the interior of the fibers.
• Example I 26 g. of l-amino-2-carbomethoxy-4-bromoanthraquinone, 59 g. of 4-aminoazobenzene, 22.1 g. of anhydrous potassium acetate and l g. of copper-(l) chloride are added to 100 g. of amyl alcohol, in the reaction mixture is stirred until homogeneity is attained and kept for 10 hours at l30-l 35. The reaction mixture, which has become yellow-green colored, is then cooled to 90', 200 g. of ethanol are added and then it is stirred for another 3-4 hours at room temperature.
• the dyestuff of the above formula precipitates as a dark greygreen crystalline powder. This is separated by filtration, washed, dried and recrystallized to further purify from ethylene glycol monomethyl ether.
• the new dyestuff dyes polyethylene glycol terephthalate fiber material in clear green shades which have very good fastness to light and sublimation.
• NHz -N NC memoir 5 -NH: .(10 CH; 0-
• NHQN NQCH1CH2OH 6 NHCH do D0.
• -COOOHIU -NH -COOCH(CH;)2 D0. NH2 CH; D0.
• NH N N- as NH1 -0 0 0 0112011930 0,115 Do.
• NHz- N N- 31 NH: -coocmomcmocm Do.
• Anthraquinone compound (1 1 lIHR1 ShadB of II dyeing on 0 Br polyglycol tare hthal- Number -NHR 0 0-K Aminoazo compound ate bres so NH; Do.
• the new dyestufi draws from aqueous dispersion onto polyglycol terephthalate or cellulose triacetate fabric in clear green shades which have very good fastness to sublimation.
• Example 77 COOCHa 31.6 g. of l-amino-2-carbomethoxy-4-chloroanthraquinone, 67.5 g. of 4-amino-3,2'-dimethyl-azobenzene, 22.1 g. of anhydrous potassium acetate and l g. of copper-(l) chloride in 120 g. of n-butanol are stirred for 24 hours at ll5-l 20, the reaction mixture is cooled to room temperature and 180 g. of methanol are added. The dyestuff of the above formula precipitates from the solution in finely crystalline fonn. It is separated by filtration, washed and dried.
• the dyestufi obtained is mixed in a weight ratio of 1:1 with the dyestuff obtained according to example I.
• the mixture is milled with sand to attain a fine distribution and dispersed in a condensation product of naphthalene sulfonic acids and formaldehyde. From this dispersion the dyestufi' mixture draws onto polyglycol terephthalate fiber material in vivid green shades which are fast to wet, light and, particularly, sublimation.
• the dyestuff is dark grey-blue crystalline powder.
• Example 80 I NH2 ll iH HQ 16 g. of 70 percent sodium hydrogen sulfide are added at 85-90 to the partial solution of 52 g. of l-nitro-2-carbethoxy-4-(4'-phenylazo-phenylamino)-ant.hraquinone in 300 g. of 50 percent aqueous pyridine and the reaction mixture is then stirred for 10 minutes at this temperature.
• the blue-green dispersion formed is diluted with 300 ml. of water, cooled to room temperature and the reaction product is separated by filtration, washed and dried.
• the dyestuff obtained dyes polyglycol terephthalate fibers from an aqueous dispersion in clear green shades which have excellent and sublimation fastness.
• Example 81 34.6 g. of 1-amino-4-brornoanthraquinone-Z-carboxylic acid, 59.1 g. of S-aminoazobenzene, 22.1 g. of anhydrous potassium acetate and 0.8 g. of copper powder are stirred in 115 g. of n-amyl alcohol for 20 hours at ll-l20". 60 g. of methanol are then added to the reaction mixture which is then cooled to room temperature whereupon the condensation product precipitates. This is dissolved in 5 percent sodium bicarbonate solution filtered to clarify, the filtrate is acidified with percent hydrochloric acid and the precipitated product is separated by filtration, washed and dried.
• Example 82 2 g. of the mixture of dyestuffs described in example 4 are dispersed in 4,000 ml. of water which contains l2 g. of sodiuin-o-phenyl phenolate and l2 g. of diammonium phosphate, and 100 g. of a polyglycol terephthalate fabric are introduced into the dyebath. Dyeing is performed for 1% hours at 95-98 The fabric is' then rinsed and thoroughly washed with dilute sodium hydroxide solution and a condensation product of napthalene sulfonic acids and formaldehyde. A green dyeing which is fast to sublimation, light and wet is obtained.
• Example 83 2 g. of the finely milled dyestuff obtained according to example l are dispersed in 4,000 ml. of water which contains 2 g. of a condensation product of naphthalene .sulfonic acids and formaldehyde. The pH of the dyebath is adjusted to 6.5 with acetic acid. 100 g. of polyglycol terephthalate fabric are introduced into the dyebath at 40, the bath is heated within l5 minutes to 120 in a closed vessel and is kept for 45 minutes at this temperature. The fabric is then rinsed with water and subsequently soaped. In this way a clear, green dyeing is obtained which has excellent fastness to sublimation, wet and light.
• Example 84 Polyglycol terephthalate fabric is impregnated in a foulard at 40 with a liquor of the following composition.
• dyestufi' according to example 80, finely dispersed 7.5 g. of sodium alginate 10 g. of condensation product of formaldehyde and naphthalene sulfonic acids and 950 g. of water.
• the fabric which has been squeezed out to a liquor content of about percent (calculated on the dry weight of the fabric) is dried at I00 and then fixed for 60 seconds at a temperature of 210.
• the dyed goods are rinsed with water, soaped and dried. Under these conditions a green dyeing is obtained which is fast to washing, light and sublimation.
• a dyestuff free from salt-forming, water-solubilizing groups which dissociate acid in water, which dyestutf is of the formula I O NH-Ri l C O-N N N- Z wherein R, represents hydrogen or lower alkyl,
• R represents hydrogen, lower alkyl, hydroxy-lower alltyl, alkenyl of at most four carbon atoms. cyclohexyl or benzyl, and
• R represents hydrogen, lower alkyl, hydroxy-lower alkyl or R and R taken together with the nitrogen atom to which they are linked, represent pyrrolidino, piperidino or morpholino,
• Z represents phenyl or phenyl monosubstituted by chlorine, bromine, fluorine, nitro, lower alkyl, lower alkoxy, hydroxy-lower alkyl, lower alkoxy-carbonyl, lower alltylsulfonyl or lower alkyl-sulfonyloxy,
• ring A bears no further substituents or is further monosubstituted by methyl, methoxy or chlorine.
• each of R and R represents hydrogen or lower alkyl, or R, and R, taken together 'with the nitrogen atom to which they are linked represent piperidino or morpholino.

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Cited By (3)

Citations (5)

• 0
  • NL NL130560D patent/NL130560C/xx active
• 1966
  • 1966-02-25 CH CH277166A patent/CH478188A/de not_active IP Right Cessation
  • 1966-02-25 CH CH1017269A patent/CH478192A/de not_active IP Right Cessation
  • 1966-02-25 CH CH1537968A patent/CH478189A/de not_active IP Right Cessation
• 1967
  • 1967-02-24 FR FR96396A patent/FR1512691A/fr not_active Expired
  • 1967-02-24 ES ES337253A patent/ES337253A1/es not_active Expired
  • 1967-02-24 BE BE694568D patent/BE694568A/fr unknown
  • 1967-02-24 NL NL6702950A patent/NL6702950A/xx unknown
  • 1967-02-24 GB GB8864/67A patent/GB1160621A/en not_active Expired
• 1969
  • 1969-07-24 US US860457*A patent/US3622558A/en not_active Expired - Lifetime

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